Apparatus for drying sticky materials



June 16, 1931. D. -J. VAN MARLE 1,310,691

APPARATUS FOR DRYING STICKY MATERIALS Filed Oct. 16, 1928 2% 1 Z5 v 55*, Z6

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Patented June 16,1931 v UNITED STATES PATENT OFFICE DIRK J. VAN LIABLE, OF BUFFALO, NEW YORK, ASSIGNOR T0 BUFFALO FOUNDRY AND COMPANY, OF BUFFALO, NEW YORK, A QORPQRATI ON OF NEW YORK- APPARATUS FOR DRYING STICKY MATERIALS Application filed October 16, 1928. Serial No. 312,826.

This invention relates to an apparatus which is more particularly designed for dry ing sticky material such as soap-chips, gums,

resins, medical extracts such as cascara and oxgall, sugar syrups and similar products which cannot be practically removed from a rotary heated drum or similar heated memand then be removed therefrom preparatory to packing or storing the same in a manner which is snnple, convenient and expeditious, and ermlts the drylng of such materials to ,be e ected continuously so that this work can be done economically.

In the accompanying drawings, showing one form of apparatus capable of use in carrying out my invention Figure 1 represents a top plan view of the machine.

Figure 2 is an end view thereof.

Figure 3 is a,vertical transverse section of the same.

In these drawings the numeral 10 represents a rotar drying drum upon the external periphery 0 which the material to be dried is deposited in the form of a film and the interior of which is heated by any suitable heating medium,.such for example as steam, which may be introduced into this drum by means of a supply pipe 11 communicating axially with one end of this drum so that the-material deposited on the exterior of the samewill be heated by the heating medium on the inside thereof.

This drum is preferably arranged horizontally and may be journaled so as to rotate about its axis in any approved manner.

- The material to be dried may also beldeposited on the exterior of this drum by various means, those shown inthe drawings be ing satisfactory, and consisting of a supply pan 12 arranged below the drum so that the underside thereof'will dip into the bath of liquid material contained in this pan, and pickup a film thereof, this an being replenished with the material to dried through a pipe 13 so as to compensate for the material WlllCll is carried away by the drum.

As the material deposited on the drum is carried around on the periphery thereof the.

same is dried due to the evaporation of the terior of the same but due to the sticky character of the material the same cannot be satisfactorily removed from the periphery of the drum by means of a scraper blade or knife as is commonly done in drying apparatus of this general character.

In order to effect such removal in accordance with the present invention, a separate removing drum 14 is employed which is also arranged horizontally and rotates about a horizontal axis and has one part of its periphery arranged close to the periphery of the drying drum so as to pick off the dried film -of material from the drying drum and transfer the same to the periphery of the removwatery content thereof by the heat on the ining drum. The place where this transfer of the material occurs is preferably in advance of the place where the material is deposited on the drying drum, so as to leave the periph cry. of the latter ready to receive another deposit of material thereon and enable the material to be thus transferred from the drying drum to" the removing drum. That part of the removing drum which faces or is opposed to the dryin drum is moved in a direction opposite to t e opposing surface of the dry-' ing drum,.and the removing drum is also so turned that its peripheral speed is slightly greater than the peripheral speed of the drying drum, whereby a pulling action on the material is produced by the removingdrum which operates to strip material from the drying drum and transfer the same effectively to the periphery of the removing drum.

The material, after being transferred to the removing drum, is scraped or removed from the periphery of the latter by any suit: ablemeans but preferably. by means of a scraping blade, doctor orknife 15 which preferably engages the periphery of this drum adjacent to its underside in advance of the Y part which .is opposed to the drying drum, and operates to remove the dried material w from the drying drum into a receptacle 16 or other means provided for its reception.

In order to permit the scraper or knife 15 to thus remove the dried material from the removing drum, the latter is cooled internally by a cooling agent, such as water, which may be introduced into this cylinder through one end of its axis by means of a supply pipe 17. By thus cooling the removing drum the dried material on the periphery of the drum is hardened and the stickiness of the same either wholly eliminated therefrom or reduced to such an extent that the dried material will not cling or adhere tenaciously to the periphery of this drum but can be easily and effectively scraped therefrom by the blade or knife 15 which directs this material into the receptacle 16.

Although the drying and removing drums may be of any suitable diameter it is preferable to make the same of the same diameter, as shown in the drawings, inasmuch as this facilitates the mounting of the same and permits of economically manufacturing these drums and using them for either purpose of drying or removing when in assembling a machine.

Various forms of gearing may also be employed for producing the above described differential speed between the drums and the rotation thereof in opposite directions. means shown in the drawings is merely an example of one suitable for this purpose, and as there shown this means comprises a large gear wheel 18 secured to one end of the axle or shaft of the drying drum and meshing with a smaller gear wheel 19 on the corresponding end of the axle or shaft of the removing drum, :1 driving pinion 20 meshing on its opposite sides with the gear wheels 18 and 19 so that the latter turn in opposite directions, a driving shaft 21 which receives motion from any suitable source, for example by means of a belt passing around either a tight pulley 22 or a loose pulley 23 on the driving shaft, and speed reducing gearing interposed between this driving shaft and the driving pinion 20, consisting of a gear pinion 24 secured to the driving shaft and meshing with an intermediate large gear wheel 25 on the intermediate shaft 26, and an intermediate inion 27 arranged on the intermediate sha 26 and meshing with the driving pinion 20, as shown in Figs. 1 and 2.

By this means the 'opposingparts of the periphery of the cooling drum and the removing drum are turned in opposite directions and the peripheral speed of the removing drum is greater than that of the drying drum,

whereby the dried material is effectively removed from the drying drum and transferred to the removing drum in the manner described. It has been found satisfactory in ac- The 15% greater than the peripheral speed of the drying drum in order to accomplish the above described purpose.

terials comprising a rotary heated drum hav ing a drying surface upon which the material to be dried is deposited and a rotary cooled drum having a cooling surface which receives the material from the heated drum and has its surface arranged in substantially contacting relation to the latter and moving in a direction opposite to that of the surface of the heated drum where these surfaces are substantially in contact.

2. An apparatus for drying sticky materials comprising a rotary heated drum having adrying surface upon which the material to be dried is deposited. and a rotary cooled drum having a cooling surface which is in substantially contacting relation to the heated drum and receives thematerial from the heated drum, said cooling drum having a peripheral speed greater than the peripheral speed of said heated drum.

3. An apparatus for drying sticky materials comprising a rotary drying drum which is heated internally and provided with an external drying surface upon which the material to be dried is deposited, and a rotary cooling drum which has its external periphery ar ranged in substantially contacting relation to the external periphery of the drying drum and moving in the opposite direction and adapted to receive the material therefrom.

4. An apparatus for drying'sticky materials comprising a rotary drying drum which is heated internally and provided with an external drying surface upon which the material to be dried is deposited, and a rotary cooling drum which has its external periphery arranged in substantially contacting relation to the external periphery of the drying drum and adapted to receive the material therefrom, the periphery of said cooling drum turning in a direction opposite to and at a greater speed than the periphery of said drying drum.

5. An apparatus for drying sticky materials comprising a rotary drying drum which is heated internally and provided with an external drying surface upon which the material to be dried is deposited, a rotary cooling drum which has its external periphery arranged in substantially contacting relation to the external periphery of the drying drum and adapted to receive the material therefrom, said drums being of the same diameter,

and means for turning said drums so that their opposing surfaces move in opposite directions and said'cooling drum turns faster than the drying drum. In testimony whereof I'hereby eflix my signature. v

DIRK-J; VAN MARLE. 

